shift Command

The shift command in Linux is used to shift the positional parameters to the left. It is typically used in shell scripts to process command line arguments passed to the script.

Here are some examples of how to use the shift command:

Shift the positional parameters to the left: shift
Shift the positional parameters to the left by a specific number: shift 2

For example, if you have a script that takes command line arguments and you want to process them one at a time, you can use the shift command to move to the next argument after processing the current one:

#!/bin/bash
while [ "$#" -gt 0 ]; do
  echo "Processing argument: $1"
  shift
done

In this example, shift is used in a while loop to process all the command line arguments passed to the script one at a time. In each iteration of the loop, the first argument is processed, and then the shift command is used to move to the next argument. Once all the arguments have been processed, the while loop exits.

It’s worth noting that the shift command modifies the positional parameters in-place, so if you want to keep the original arguments, you should copy them to a new variable before using shift.

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